| Bryn Social Care Limited | Market Drayton | 2025 |
| Bs-Traffic-Services Ltd | Doncaster | 2024 |
| BSA Care Service Limited | Leamington Spa | 2025 |
| Bsaea Limited | Beverley | 2019 |
| BSB Healthcare Ltd | Leeds | 2021 |
| Bscare & Recruitment Ltd | Westcliff-On-Sea | 2024 |
| BSJ Groups Limited | Bristol | 2023 |
| Bstl Lyfe Ltd | Bristol | 2022 |
| BT Energy Solutions Limited | Portsmouth | 2020 |
| BTD Holdings Ltd | Bungay | 2024 |
| Btfy Ltd | Bradford | 2022 |
| Btvk Consultancy Limited | West Drayton | 2020 |
| Bubble Home Care Ltd | Chelmsford | 2026 |
| Bucknor Health Limited | Bradford | 2024 |
| Bucks Fire Safety Training Limited | London | 2019 |
| Bucks Quality Care Limited | High Wycombe | 2018 |
| Buddysafe Ltd | Chester Le Street | 2020 |
| Budworth Adventures Ltd | Salisbury | 2016 |
| Building and Fire Safety Cases Limited | Royston | 2024 |
| Building Communities CIC | Birmingham | 2021 |
| Building Detection Services Ltd | Falkirk | 2019 |
| Building Information Box Plus Limited | Dereham | 2022 |
| Building Opportunities Learning Disabilities Ltd | Neath | 2024 |
| Bukkycares Limited | London | 2021 |
| Buksol Holistic Assessment Services Ltd | London | 2021 |
| Bulletproof Consulting Limited | Newton Abbot | 2024 |
| Bulwark Fire Protection Ltd | Ipswich | 2022 |
| Bump and I Limited | Salford | 2024 |
| Bumpsadaisy Ltd | Evesham | 2009 |
| Bumtotecă.Srl Ltd | Cambridge | 2019 |
| Bundles of Joy Maternity Project CIC | Kington | 2025 |
| Burcot Autonomy Limited | London | 2025 |
| Burns Management Ltd | Glasgow | 2022 |
| Burrows Health Project CIC | Wembley | 2025 |
| Burslem School of Art Trust | Stoke On Trent | 1999 |
| Burton Fire Contracts Limited | Horley | 2023 |
| Burundi International Ship Registry Limited | London | 2020 |
| Business Essentials Ltd | Hounslow | 2025 |
| Business Planet Group Ltd | London | 2018 |
| Business Retention Solutions Ltd | St. Helens | 2025 |
| Business Safety ACT Services Limited | Sutton | 2024 |
| Busy-Ness Automation Ltd | Lincoln | 2025 |
| Butterfly Touch CIC | South Croydon | 2023 |
| Butterfly Wellbeing Ltd | Abbots Bromley | 2021 |
| Butterfly Wood Ltd | Mansfield | 2025 |
| Buxton Healthcare Ltd | Norwich | 2022 |
| Buzy Brainz Konzult Ltd | Lincolnshire | 2023 |
| Buzz Fire & Security Ltd | Belper | 2020 |
| BY Steph Ltd | Northampton | 2026 |
| Byrhtnoth Defence Limited | Colchester | 2025 |
| C & L Aviation Limited | Weymouth | 2010 |
| C & M Facilities Scotland Ltd | Dunlop | 2019 |
| C &C Care UK Limited | Cardiff | 2022 |
| C Anderson Safety Services Limited | Redcar | 2022 |
| C D H Power Services Ltd | Preston | 2025 |
| C Flynn Limited | Ayr | 2017 |
| C G Dennis Fire Safety Services Ltd | Slough | 2011 |
| C H R Care Private Limited | Milton Keynes | 2023 |
| C J Logan Limited | Doncaster | 2016 |
| C M D Remote Services Limited | Plymouth | 2008 |
| C of CD Ltd | London | 2014 |
| C Osborn Offshore Services Limited | Southampton | 2018 |
| C P Fire Consultants Ltd | Chippenham | 2006 |
| C Safety Solutions Limited | Walsall | 2022 |
| C Swallow Consulting Limited | South Croydon | 2013 |
| C&D(Uk) Limited | Bodmin | 2024 |
| C&Gsafety&Training Ltd | Inverurie | 2020 |
| C&H Fire Protection Ltd | Leigh-On-Sea | 2020 |
| C&J Site Services Limited | Gloucester | 2015 |
| C&S Traffic Management Ltd | Watford | 2026 |
| C&S Wellbeing Hub CIC | London | 2026 |
| C&V Limited | Bordon | 2018 |
| C-Rett Limited | Wolverhampton | 2025 |
| C. Quartermain Ltd | Bristol | 2020 |
| C. Sebs Care Ltd | Thatcham | 2022 |
| C.Appiah Ltd | Reading | 2022 |
| C.C.F Fire Security Limited | Godalming | 2017 |
| C.E.R Parker Limited | Rochester | 2021 |
| C.Nembhard Ltd | London | 2025 |
| C.Otoide Ltd | Nottingham | 2024 |
| C.S.A Fire Ltd | Grays | 2024 |
| C.Toyin.G Ltd | Dagenham | 2024 |
| C.W. Fire Protection Services Limited | Gillingham | 2000 |
| C21 Associates Limited | Ashford | 2014 |
| C3 Solutions Limited | Wadebridge | 2013 |
| CA Fire Safety & Security Ltd | London | 2024 |
| CA Fire Solutions Ltd | Kettering | 2025 |
| CAA International Limited | Crawley | 2000 |
| Cabot Fire Ltd | Bristol | 2025 |
| Cabot Homecare Ltd | Bristol | 2025 |
| CAC the Restoration House | Manchester | 2024 |
| Caffra Trading Limited | Newark | 2014 |
| Cafm Traffic Management Ltd | Selston | 2024 |
| Cage Advocacy UK Ltd | London | 2007 |
| Caitlin Jane Consultancy Limited | Chester | 2023 |
| CAL Events Ltd | Newtownabbey | 2024 |
| Calculator Ltd | Ware | 2025 |
| Caledonian Care Services Ltd. | Edinburgh | 2021 |
| Caledonian Fire Safety Solutions Ltd | Kilwinning | 2017 |
| Caliburn Industries Ltd | London | 2025 |